That's where Asimov's Three Laws of Robotics comes in:
- First Law: A robot may not injure a human being or, through inaction, allow a human being to come to harm.
- Second Law: A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.
- Third Law: A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
The temptation will be to get rid of the Third Law, so that the robot can protect itself, even if it has to harm a crook to do so. We can say, "Those guys are thieves who deserve what they get!", but that's a slippery slope.
The bots will have IR vision, so can clean up in the dark. Might scare someone charging late at night, though, so might need a sign saying "Beware of Bot", but that sounds like the bot is dangerous, so maybe "Robots Can Work at Night" or "Night Robots at Work". Maybe have them play happy Disney tunes or ice cream truck music to set the mood so people don't freak out.
In the summer, it wouldn't be the Hollywood Tesla Diner, but they could hand out ice cream, too.
BTW, has anyone ever seen an ice cream truck at a SC? A Buc-ee's or Target or any other store probably wouldn't allow that, but maybe Tesla can hire a few for locations with no food (and who are security guards in disguise as well).